The Structure of a Resonance State
The existence of a structure in a resonance state is investigated systematically. By resonance structure it is understood the energy dependence across the resonance width of the fragment state distributions produced upon resonance decay. Different types of resonances, both isolated and overlapping ones, have been explored for this purpose. It is found that isolated resonances do not present an appreciable energy dependence of the product state distributions. On the contrary, overlapping resonances exhibit a clear structure regarding the fragment distributions, which becomes increasingly more pronounced as the intensity of overlap between resonances increases. Such an energy dependence of the product distributions arises from quantum interference between the amplitudes of overlapping resonances, as demonstrated formally here by the equations derived from the condition of resonance overlap. Application of the present effect to the control of the fragment state distributions produced in a wide variety of molecular processes governed by resonance states is envisioned.